understand that there is a big difference between 128 kbit mp3 and 320 kbit mp3, yes mp3 is still a compression format but really unless you have an a/b compairison you will not hear the difference between the cd and 320. now granted that has its limits too, if your listening to opera or a single accustic guitar you will hear some loss, but while going down the road in your car listening to your fav rock band or what have you, you will not hear any difference at all.
and atrac has its downsided lp4 sounds like a poor 128 kbit mp3 so don't bash one technology when not fully knowing about it.
I have over 60 gigs of 320 kbit mp3s and all of them are used to putting music on my md. I like my mp3s.